Waves, Optics & Motion Test

Question 1: a) A transverse wave is made up of ____________ and ___________. b) A longitudinal wave is made up of ___________ and ___________. c) The energy of a wave depends on its ______________. d) The speed of a wave depends on the ___________ through which it travels. e) __________ is an example of a longitudinal wave. f) The greater the frequency of a wave, the shorter is its __________________. (8marks)

Question 2: a) As the waves pass from deep to shallow water they are changing direction because they are changing _________. b) The wavelength of the waves _______________. c) This phenomenon of bending is called ______________. d) Choose the correct answer: i) The waves are being bent (towards, away from) the normal. ii) The frequency of the waves (increases, decreases, remains the same). e) Find the velocity of a wave having a frequency of 4 Hz and a wavelength of 0.6m. (8marks)

Question 3: Question 3: A student is standing at a distance of 80 m from a large wall. If she claps and receives an echo after 0.48 seconds, calculate the speed of sound in air. b) Say whether the statement is true or false: i) The speed of sound depends on the frequency of her clapping. ii) The louder she claps, the faster the sound. iii) The shorter the distance to the wall, the shorter the time to receive an echo. iv) An echo is heard because the sound is refracted by the wall. (8 marks)

Question 4: Name the electromagnetic wave in each case. The same wave can be used more than once. Type of wave a) Are used to detect false banknotes. b) Are detected by the human eyes. c) Can be used to kill cancer cells. d) Can penetrate flesh but not bones. e) Are used to cook food. f) Used in night vision cameras. g) Used in remotes of TV. h) Used in radar equipment. (8 marks)

Focal length of lens = 10 cm Question 5: Focal length of lens = 10 cm Image distance = 14 cm Object distance = 28 cm The lens is being used as a __________________. b) Choose the correct answer: i) The image is (real or virtual). ii) The image is (enlarged or diminished). iii) The image is (inverted or upright). c) Calculate the magnification of the lens. d) Suggest a suitable object distance if the lens is used as a magnifying glass. (8marks)

Question 6: Copy the diagram and show the path taken by the ray of light through and out of the glass block b i) Copy the diagram and show the path taken by the ray of light through and out of the glass prism ii) In this case the ___________ angle of glass is ___________. iii) What is the name of the type of reflection that occurs? (8marks)

Question 7: a) Change 360 km/h to m/s. b) A motorcyclist covers a distance of 560 m in 50 seconds. Find his average speed. c) State two factors that affect braking distance. d) State two factors that affect thinking distance. (8 marks)

Question 8: The speed of a car is increased from 4 m/s to 12 m/s while accelerating at 3m/s2. Find the distance travelled. (3 marks)

Question 9: A car starts from rest and reaches a speed of 20 m/s in 5 seconds. What is the car’s initial velocity? Calculate the acceleration of the car. c) Calculate the distance travelled by the car. (8 marks)

Question 10: A car travels at constant speed of 15 m/s for 10 seconds. It is then decelerated to rest 6 seconds later. a) Calculate the distance travelled at constant speed. b) Calculate the deceleration of the car. c) Calculate the distance travelled while decelerating. (7 marks)